摘要
细观损伤参数的确定一直是GTN模型在工程应用的瓶颈,参数选取得是否合理直接影响模拟结果的准确程度。基于Hill’48—GTN(Gurson-Tvergaard-Needleman)各向异性损伤模型,通过用户材料子程序Vumat,将其嵌入ABAQUS软件中。最后以DP780为例,数值模拟其单轴拉伸过程,与试验曲线结合,通过有限元仿真逆向确定GTN参数;并对DP780进行槽型件成形过程仿真,通过拉伸断裂的位置以及减薄率表明所获得参数较准确,同时说明此模型可用于冲压成形领域。
The determination of mesoscopic damage parameters limits GTN model application in engineering, the selection of parameters influences the simulation results. Based on Hill ＂48 --GTN （Gurson - Tvergaard - Needleman） anisotropic damage model, constitutive model is embedded in ABAQUS software by writing the user material subroutine Vumat. Finally, GTN parameters of DP780 are identified through combined numerical simulation with test curve by the finite element inverse method; the groove-shape numerical simulation results show that the obtained parameters can be accurately obtained through the position of the tensile fracture and the thinning rate.
出处
《农业装备与车辆工程》
2015年第12期10-13,共4页
Agricultural Equipment & Vehicle Engineering
基金
山东省自然科学基金ZR2011EL037
